In a discharge tube ionization of enclosed gas is produced …

Physics Electron, Photon, Photoelectric Effect and X-rays NEET Previous Year Question - Dule Nature of Radiation MCQ (Single Correct)

In a discharge tube ionization of enclosed gas is produced due to collisions between

neutral gas atoms/molecules

positive ions and neutral atoms/ molecules

negative electrons and neutral atoms/ molecules

photons and neutral atoms/molecules.

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In a discharge tube, after being accelerated through a high potential difference the ions in the gas strike the cathode with huge kinetic energy. This collision liberates electrons from the cathode. These free electrons from the cathode. These free electrons can further liberate ions from gas molecules through collisions. The positive ions are attracted towards the cathode and negatively electrons move towards anode. Thus, ionization of gas results.

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